Lesson 5

lessons/src/main/java/lessons/lesson05/App.java

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+package Lesson5;
+
+/**
+ * @author Shohjahon
+ * @version 1.0
+ */
+
+public class App {
+    public static void main(String[] args) {
+        Teacher teacher = new Teacher("Shohjahon", "01");
+
+        Course course = new Course("1", "Java", teacher);
+
+        Student student1 = new Student("Ali", "001");
+        Student student2 = new Student("Bob", "002");
+        course.addStudent(student1);
+        course.addStudent(student2);
+
+        course.markAttendance("001", "2025-10-03", true);
+        course.markAttendance("002", "2025-10-03", false);
+
+        course.assignScore("001", 95.0);
+        course.assignScore("002", 88.5);
+
+        course.displayCourseDetails();
+
+        student1.displayAttend();
+        student2.displayAttend();
+    }
+}

lessons/src/main/java/lessons/lesson05/Course.java

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+package Lesson5;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Course {
+    private String courseId;
+    private String courseName;
+    private Teacher teacher;
+    private List< Student > students = new ArrayList<>();
+
+    public Course( String courseId, String courseName, Teacher teacher ) {
+        this.courseId = courseId;
+        this.courseName = courseName;
+        this.teacher = teacher;
+    }
+
+    public void addStudent( Student student ) {
+        students.add( student );
+    }
+
+    public void markAttendance( String studentId, String date, boolean present ) {
+        for ( Student student : students ) {
+            if ( student.getId().equals( studentId ) ) {
+                student.markAttendance( date, present );
+                break;
+            }
+        }
+    }
+
+    public void assignScore( String studentId, double score ) {
+        for ( Student student : students ) {
+            if ( student.getId().equals( studentId ) ) {
+                student.setScore( score );
+                break;
+            }
+        }
+    }
+
+    public void displayCourseDetails() {
+        System.out.println( "\nCourse: " + courseName + " (ID: " + courseId + ")" );
+        teacher.displayInfo();
+        for ( Student s : students ) {
+            s.displayInfo();
+        }
+    }
+}

lessons/src/main/java/lessons/lesson05/Person.java

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+package Lesson5;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+
+@AllArgsConstructor
+@Getter
+@Setter
+public abstract class Person {
+    private String name;
+    private String id;
+
+    public abstract void displayInfo();
+}

lessons/src/main/java/lessons/lesson05/Student.java

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+package Lesson5;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Student extends Person {
+    private Map<String, Boolean> attendanceLog = new HashMap<>();
+    @Getter
+    @Setter
+    private double score;
+
+    public Student(String name, String id) {
+        super(name, id);
+    }
+
+    public void markAttendance(String date, boolean present) {
+        attendanceLog.put(date, present);
+    }
+
+    public void displayAttend() {
+        System.out.printf("Attendance for %s:", getName());
+        for (Map.Entry<String, Boolean> entry : attendanceLog.entrySet()) {
+            String status = entry.getValue() ? "Present" : "Absent";
+            System.out.printf("  %s -> %s%n", entry.getKey(), status);
+        }
+    }
+
+    @Override
+    public void displayInfo() {
+        System.out.println("Student: " + getName() + " (ID: " + getId() + "), Score: " + score);
+    }
+}

lessons/src/main/java/lessons/lesson05/Teacher.java

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+package Lesson5;
+
+public class Teacher extends Person {
+    public Teacher(String name, String id) {
+        super(name, id);
+    }
+
+    @Override
+    public void displayInfo() {
+        System.out.println("Instructor: " + getName() + " (ID: " + getId() + ")");
+    }
+}